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Studio Technologies Model 750 ENG Audio Mixer

Mfr #: 750

Dale #: STUD-750

Our Price: $2,995.00

Availability: Special Order

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Studio Technologies Model 750 ENG Audio Mixer

High-performance audio mixer designed for use in ENG, SNG, and specialized broadcast applications.

Highlights

Four mic/line inputs
Two stereo line inputs
Extensive monitor section
Main and AUX stereo audio buses
Studio-quality limiter/compressors
Three isolated main output connections
Separate speaker and headphone outputs
Setup section, including voice record/playback and tone generation
VU meters with peak LEDs
All operator controls on front panel
Two rack-space mounting

General Audio Parameters	Frequency Response: 20 Hz-20 kHz, ±0.5 dB, stereo line in/main out 1 Distortion (THD+N): 0.04%, measured at 1 kHz, mic in/main out 3 S/N Ratio: 80 dB, referenced to +4 dBu, mic in/main out 3
Mic/Line Inputs: 6	Type: balanced, transformer-coupled Level Range: selectable for mic or line level Microphone Power: +48 V phantom-type Low-Cut Filter: –3 dB at 85Hz, 18 dB/octave slope Status LED: bi-color, signal present/peak Pan Type: constant energy Pan Attenuation: 60 dB, nominal
Stereo Line Inputs: 2	Type: electronically balanced Nominal Level: +4 dBu (–8 to +10 dBu acceptable) Status LED: 2, bi-color, signal present/peak
Main Audio Bus Limiter/Compressor: 2 Threshold: +10 dBu (6 dB above nominal output level) Attack Time: 2 mSec, nominal Release Time: 100 mSec, nominal Slope: 5:1, nominal	Function: controls dynamic range of output buses 1 and 2 Type: single-knee, VCA-controlled Slope: 5:1 Threshold: configurable, choices are: 6 dB over nominal (+10 dBu on main outs, factory default); 2 dB over nominal (+6 dBu on main outs); disabled Attack Time: 2 ms Release Time: 100 ms Status LEDs: 2, compressor active
Outputs — Main 1, Main 2, AUX, Configurable, and Setup Direct	Type: electronically balanced, compatible with balanced or unbalanced loads Nominal Level: +4 dBu Maximum Level: +27 dBu into 10 k ohms, +26 dBu into 600 ohms
Main Output 3	Type: balanced, transformer-coupled Nominal Level: mic –36, line +4 dBu, selectable Maximum Level: +22 dBu into 10 k ohms
Monitor Output	Type: electronically balanced, compatible with balanced or unbalanced loads Nominal Level: –2 dBu Maximum Level: +21 dBu into 10 k ohms, +20 dBu into 600 ohms
Headphone Output	Compatibility: intended for connection to headphones with impedance of 100 ohms or greater Maximum Output Voltage: 8 Vpp, 100 ohm load
External Monitor Inputs	Quantity: 2, stereo Type: electronically balanced Nominal Level, Input 1: +4 dBu Nominal Level, Input 2: –10 or +4 dBu, selectable
Setup Section	Record L+R Duration: 12 seconds, maximum Record L Only, R Only Duration: 4 seconds, maximum Record Audio Source: internal microphone or external line level, selectable Single Tone Frequency: 400 Hz or 1 kHz, selectable Basic Multi-Tone Frequencies: 1 kHz reference, followed by 10 kHz, 1 kHz, 100 Hz Advanced Multi-Tone Frequencies: 1 kHz reference, followed by 14 tones (15 kHz-50 Hz) Setup Direct Output Level: +4 dBu, nominal, adjustable, range –2 to +10 dBu
Talk Back	connects voice audio source to setup direct and/or main and AUX outputs
Record/Talk Back External Audio Input	Type: electronically balanced Level Range: –20 to +4 dBu, adjustable
Meters: 2	Type: analog panel, VU scale, with signal peak LED Calibration: 0 VU = +4 dBu, nominal, adjustable, range –2 to +10 dBu
Connectors	Mic/Line, Stereo Line, Main Out 3: 3-pin XLR-type (pin 2 high) All Other Audio: ¼-inch, 3-conductor phone jacks AC Mains: 3-blade IEC-type
AC Mains Requirement	100, 120, or 220/240 V, ±10%, factory configured, 50/60 Hz, 40 watts maximum
Dimensions (Overall)	19.00 inches wide (48.3 cm) 3.49 inches high (8.9 cm) 9.50 inches deep (21.4 cm)
Mounting	two spaces in a standard 19-inch rack
Weight	14.0 pounds (6.4 kg)

Main Audio Bus

Signals from the mic/line input channels, stereo line input channels, and the setup section combine to create the main audio bus. The main bus is stereo, but can be used to create two independent monaural audio mixes. Studio-quality, stereo limiter/compressors are provided to control the dynamic range of the main bus. Far from a simple "clipper," each limiter/compressor circuit utilizes a sophisticated laser-trimmed voltage-controlled amplifier (VCA) integrated circuit for quiet, low-distortion level control. For installation flexibility, three sets of stereo output circuits provide access to the main bus: two are electronically balanced, line-level; the third is transformer-balanced, with a selectable mic or line output level.

AUX Audio Bus

The Model 750 provides a second stereo bus that can be configured to operate in either of two modes: as an auxiliary (AUX) output or as a monitor interrupt function. In the AUX output mode special applications are easily supported, such as creating a "mix-minus" feed or serving as a second stereo output bus for on-air use. Signals from the mic/line input channels, stereo line input channels, and the setup section can be assigned to the AUX bus. Direct access to the AUX bus is provided by means of an electronically balanced, line-level output.

In most cases, however, the AUX interrupt mode will be selected, allowing the normal monitor source to be interrupted and the AUX signal monitored in its place. Model 750 users will find this function extremely useful, enabling one or more of the input channels to be monitored without interfering with signals assigned to the main output bus. Two DIP switches, accessible from the front panel, allow the interrupt function to be configured. One switch selects whether the monitor speaker output will be interrupted by the AUX signal, the other whether the headphone output will be interrupted.

Configurable Outputs

Four monaural, balanced, line-level outputs can serve in a wide range of installation-specific applications. DIP switches, located on the back panel, are used to select from the five available signal sources: main audio bus left and right, AUX audio bus left and right, and mic/line input channel direct. The switches can be set to create a number of resources, including: additional stereo outputs, monaural outputs from the main or AUX audio buses, or direct outputs from the mic/line input channels.

Monitor Section

Reminiscent of much larger audio consoles, the Model 750's monitor section gives the operator an extensive set of resources. Separate stereo outputs and level controls are provided for connection to a monitor amplifier and headphones. In addition to monitoring the main and AUX audio buses, provision has been made for monitoring two external audio sources. These stereo inputs are intended to be connected to off-air, microwave, or satellite receivers. External Monitor Input 1 is compatible with "+4" signals, while External Monitor Input 2 can be set, using a front-panel DIP switch, for "–10" or "+4" compatibility.

Multiple sources can be simultaneously selected for monitoring. This can prove useful by allowing, for example, an operator to simultaneously monitor a local mix and an externally provided mix-minus signal. A mono function allows the monitored audio source to be checked for phase cancellation problems and acceptable "sum-to-monaural" performance.

The AUX interrupt mode allows monitoring of selected input channels and the setup section without interfering with normal operation of the main audio bus. For operator assistance, the meters can be configured to monitor the AUX bus whenever it is active.

The mechanical VU-type meters, along with peak level LED indicators, provide a "user-friendly" indication of audio-signal levels. Fanatics for addressing the details, Studio Technologies has even eliminated the issue of burned-out meter-scale illumination by implementing a solid-state, LED-based lighting scheme.

Setup Section

Unique to the Model 750 are the features provided by the setup section, the highlight being the ability of the operator to record and play back three voice identification segments. The Left+Right segment allows a voice message of up to 12 seconds in length to be recorded, with playback going to the left and right output channels. The Left Only and Right Only segments allow recording of up to 4 seconds each, with playback going only to their respective channels. The voice segments can prove useful, allowing the facilities that receive the vehicle's signal (generally provided by microwave or satellite links) to quickly "learn" more about the origin of the transmission. Information such as vehicle identity, physical location, the names of technical and on-air personnel, mobile telephone numbers, and left and right channel identifiers can easily be sent. The voice audio source is selectable, being either an internal microphone or an externally connected signal.

The setup section also contains a digitally controlled sine-wave generator which, under software control, produces a "0-level" single-tone reference or multi-tone sequences. The single-tone output is selectable for either 400 Hz or 1 kHz—the two industry-standard frequencies. The tone sequences allow frequency response testing of a transmission chain, with the choice of either a basic or an advanced sequence. In the basic setting a 1 kHz "0-level" reference is generated, followed by individual 10 kHz, 1 kHz, and 100 Hz tones. In the advanced setting a 1 kHz reference is generated, followed by 14 individual tones, ranging from 15 kHz to 50 Hz.

While the voice and tone setup signals can be assigned to the main and AUX audio buses, a direct line-level stereo output is also provided. This allows the generation of setup and test signals without interfering with normal audio mixer operation.

Talk Back

The Model 750 includes a talk back function. Two pushbutton switches allow the selected voice source to be routed to the setup direct output and/or the main and AUX audio buses.

Installation

While the Model 750 is loaded with features, it only requires two spaces in a standard 19-inch rack. Neutrik XLR-type and ¼-inch, 3-conductor audio connectors are used for audio interconnections. Mains power is factory configured for 100, 120, or 220/240 V, 50/60 Hz.